Structural Remediation & Extension, Epsom KT18

This Epsom project brought together two challenges in one: stabilising a structure that was showing movement, then designing an extension on top of the remediated base. EMA Structures addressed both, taking the property from a foundation problem to additional, stable living space.

The challenge

The existing structure included a piled retaining wall (500mm-diameter piles with an 800mm capping beam) and a reinforced concrete staircase, both showing signs of movement. Before any extension could be considered, the cause of movement had to be understood and the structure stabilised.

Remediation

EMA recommended a staged remediation: isolated or continuous mass-concrete underpinning carried out in short 1.0m sections, gap remediation using a Flexcell board and an epoxy repair mix, and a six-month monitoring period using Tell Tale kits to confirm that movement had stabilised before further works.

Extension design

With the structure stabilised and monitored, EMA designed a second-floor extension that integrated with the existing building, maintaining both structural integrity and the look of the property.

Outcome

The client moved from a property with active structural movement to a stabilised building with additional living space, delivered through a single engineering-led process from diagnosis to design.